Modern heliographic processes : a manual of instruction in the art of reproducing drawings, engravings, manuscripts, etc., by the action of light : for the use of engineers, architects, draughtsmen, artists, and scientists (1888)
Lietze, Ernst · New York : Van Nostrand · leaf 27
y conditionally. In order that we may represent to ourselves a perfect picture of the chemical and physical action of the different rays of light, it will be necessary for us to dwell a little on the decomposition of light. As is well known, a ray, or a pencil of rays, of solar light (or white… … trum as primary. These are, in order, beginning with the least refracted, red, orange, yellow, green, blue, indigo and violet. Newton considered all the prismatic colors as simple, because they can not be further decomposed. If any colored ray of the spectrum be transmitted through a small aperture…
Photographic reproduction of plans, drawings, etc · Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
